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annotate planemo/lib/python3.7/site-packages/boto/sdb/db/model.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Copyright (c) 2006,2007,2008 Mitch Garnaat http://garnaat.org/
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21
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22 from boto.sdb.db.property import Property
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23 from boto.sdb.db.key import Key
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24 from boto.sdb.db.query import Query
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25 import boto
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26 from boto.compat import filter
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27
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28 class ModelMeta(type):
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29 "Metaclass for all Models"
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30
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31 def __init__(cls, name, bases, dict):
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32 super(ModelMeta, cls).__init__(name, bases, dict)
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33 # Make sure this is a subclass of Model - mainly copied from django ModelBase (thanks!)
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34 cls.__sub_classes__ = []
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35
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36 # Do a delayed import to prevent possible circular import errors.
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37 from boto.sdb.db.manager import get_manager
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38
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39 try:
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40 if filter(lambda b: issubclass(b, Model), bases):
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41 for base in bases:
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42 base.__sub_classes__.append(cls)
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43 cls._manager = get_manager(cls)
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44 # look for all of the Properties and set their names
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45 for key in dict.keys():
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46 if isinstance(dict[key], Property):
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47 property = dict[key]
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48 property.__property_config__(cls, key)
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49 prop_names = []
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50 props = cls.properties()
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51 for prop in props:
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52 if not prop.__class__.__name__.startswith('_'):
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53 prop_names.append(prop.name)
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54 setattr(cls, '_prop_names', prop_names)
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55 except NameError:
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56 # 'Model' isn't defined yet, meaning we're looking at our own
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57 # Model class, defined below.
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58 pass
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59
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60 class Model(object):
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61 __metaclass__ = ModelMeta
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62 __consistent__ = False # Consistent is set off by default
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63 id = None
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64
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65 @classmethod
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66 def get_lineage(cls):
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67 l = [c.__name__ for c in cls.mro()]
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68 l.reverse()
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69 return '.'.join(l)
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70
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71 @classmethod
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72 def kind(cls):
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73 return cls.__name__
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74
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75 @classmethod
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76 def _get_by_id(cls, id, manager=None):
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77 if not manager:
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78 manager = cls._manager
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79 return manager.get_object(cls, id)
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80
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81 @classmethod
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82 def get_by_id(cls, ids=None, parent=None):
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83 if isinstance(ids, list):
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84 objs = [cls._get_by_id(id) for id in ids]
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85 return objs
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86 else:
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87 return cls._get_by_id(ids)
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88
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89 get_by_ids = get_by_id
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90
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91 @classmethod
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92 def get_by_key_name(cls, key_names, parent=None):
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93 raise NotImplementedError("Key Names are not currently supported")
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94
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95 @classmethod
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96 def find(cls, limit=None, next_token=None, **params):
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97 q = Query(cls, limit=limit, next_token=next_token)
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98 for key, value in params.items():
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99 q.filter('%s =' % key, value)
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100 return q
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101
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102 @classmethod
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103 def all(cls, limit=None, next_token=None):
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104 return cls.find(limit=limit, next_token=next_token)
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105
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106 @classmethod
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107 def get_or_insert(key_name, **kw):
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108 raise NotImplementedError("get_or_insert not currently supported")
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109
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110 @classmethod
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111 def properties(cls, hidden=True):
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112 properties = []
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113 while cls:
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114 for key in cls.__dict__.keys():
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115 prop = cls.__dict__[key]
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116 if isinstance(prop, Property):
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117 if hidden or not prop.__class__.__name__.startswith('_'):
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118 properties.append(prop)
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119 if len(cls.__bases__) > 0:
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120 cls = cls.__bases__[0]
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121 else:
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122 cls = None
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123 return properties
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124
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125 @classmethod
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126 def find_property(cls, prop_name):
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127 property = None
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128 while cls:
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129 for key in cls.__dict__.keys():
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130 prop = cls.__dict__[key]
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131 if isinstance(prop, Property):
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132 if not prop.__class__.__name__.startswith('_') and prop_name == prop.name:
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133 property = prop
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134 if len(cls.__bases__) > 0:
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135 cls = cls.__bases__[0]
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136 else:
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137 cls = None
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138 return property
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139
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140 @classmethod
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141 def get_xmlmanager(cls):
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142 if not hasattr(cls, '_xmlmanager'):
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143 from boto.sdb.db.manager.xmlmanager import XMLManager
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144 cls._xmlmanager = XMLManager(cls, None, None, None,
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145 None, None, None, None, False)
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146 return cls._xmlmanager
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147
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148 @classmethod
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149 def from_xml(cls, fp):
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150 xmlmanager = cls.get_xmlmanager()
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151 return xmlmanager.unmarshal_object(fp)
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152
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153 def __init__(self, id=None, **kw):
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154 self._loaded = False
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155 # first try to initialize all properties to their default values
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156 for prop in self.properties(hidden=False):
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157 try:
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158 setattr(self, prop.name, prop.default_value())
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159 except ValueError:
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160 pass
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161 if 'manager' in kw:
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162 self._manager = kw['manager']
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163 self.id = id
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164 for key in kw:
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165 if key != 'manager':
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166 # We don't want any errors populating up when loading an object,
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167 # so if it fails we just revert to it's default value
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168 try:
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169 setattr(self, key, kw[key])
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170 except Exception as e:
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171 boto.log.exception(e)
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172
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173 def __repr__(self):
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174 return '%s<%s>' % (self.__class__.__name__, self.id)
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175
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176 def __str__(self):
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177 return str(self.id)
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178
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179 def __eq__(self, other):
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180 return other and isinstance(other, Model) and self.id == other.id
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181
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182 def _get_raw_item(self):
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183 return self._manager.get_raw_item(self)
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184
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185 def load(self):
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186 if self.id and not self._loaded:
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187 self._manager.load_object(self)
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188
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189 def reload(self):
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190 if self.id:
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191 self._loaded = False
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192 self._manager.load_object(self)
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193
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194 def put(self, expected_value=None):
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195 """
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196 Save this object as it is, with an optional expected value
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197
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198 :param expected_value: Optional tuple of Attribute, and Value that
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199 must be the same in order to save this object. If this
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200 condition is not met, an SDBResponseError will be raised with a
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201 Confict status code.
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202 :type expected_value: tuple or list
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203 :return: This object
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204 :rtype: :class:`boto.sdb.db.model.Model`
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205 """
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206 self._manager.save_object(self, expected_value)
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207 return self
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208
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209 save = put
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210
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211 def put_attributes(self, attrs):
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212 """
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213 Save just these few attributes, not the whole object
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214
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215 :param attrs: Attributes to save, key->value dict
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216 :type attrs: dict
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217 :return: self
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218 :rtype: :class:`boto.sdb.db.model.Model`
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219 """
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220 assert(isinstance(attrs, dict)), "Argument must be a dict of key->values to save"
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221 for prop_name in attrs:
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222 value = attrs[prop_name]
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223 prop = self.find_property(prop_name)
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224 assert(prop), "Property not found: %s" % prop_name
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225 self._manager.set_property(prop, self, prop_name, value)
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226 self.reload()
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227 return self
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228
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229 def delete_attributes(self, attrs):
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230 """
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231 Delete just these attributes, not the whole object.
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232
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233 :param attrs: Attributes to save, as a list of string names
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234 :type attrs: list
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235 :return: self
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236 :rtype: :class:`boto.sdb.db.model.Model`
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237 """
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238 assert(isinstance(attrs, list)), "Argument must be a list of names of keys to delete."
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239 self._manager.domain.delete_attributes(self.id, attrs)
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240 self.reload()
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241 return self
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242
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243 save_attributes = put_attributes
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244
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245 def delete(self):
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246 self._manager.delete_object(self)
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247
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248 def key(self):
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249 return Key(obj=self)
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250
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251 def set_manager(self, manager):
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252 self._manager = manager
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253
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254 def to_dict(self):
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255 props = {}
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256 for prop in self.properties(hidden=False):
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257 props[prop.name] = getattr(self, prop.name)
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258 obj = {'properties': props,
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259 'id': self.id}
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260 return {self.__class__.__name__: obj}
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261
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262 def to_xml(self, doc=None):
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263 xmlmanager = self.get_xmlmanager()
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264 doc = xmlmanager.marshal_object(self, doc)
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265 return doc
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266
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267 @classmethod
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268 def find_subclass(cls, name):
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269 """Find a subclass with a given name"""
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270 if name == cls.__name__:
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271 return cls
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272 for sc in cls.__sub_classes__:
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273 r = sc.find_subclass(name)
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274 if r is not None:
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275 return r
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276
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277 class Expando(Model):
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278
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279 def __setattr__(self, name, value):
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280 if name in self._prop_names:
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281 object.__setattr__(self, name, value)
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282 elif name.startswith('_'):
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283 object.__setattr__(self, name, value)
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284 elif name == 'id':
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285 object.__setattr__(self, name, value)
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286 else:
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287 self._manager.set_key_value(self, name, value)
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288 object.__setattr__(self, name, value)
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289
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290 def __getattr__(self, name):
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291 if not name.startswith('_'):
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292 value = self._manager.get_key_value(self, name)
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293 if value:
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294 object.__setattr__(self, name, value)
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295 return value
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296 raise AttributeError